Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 177 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns left 180°, then right 30°. What does the gyro read now (0° to 359°)?
2. 2.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns left 45°, then right 60°, then left 30°. What does the gyro read now (0° to 359°)?
5. 5.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
6. 6.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
8. 8.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
9. 9.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
10. 10.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
11. 11.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
12. 12.🧭 A robot should turn right 90°, but its gyro shows it turned 81°. How many degrees must it turn more to the right?
13. 13.🧭 A robot faces east. It does: turn left, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
14. 14.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
15. 15.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
16. 16.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 32 times. How many times does the driven gear turn?
18. 18.🧭 A robot should turn right 45°, but its gyro shows it turned 33°. How many degrees must it turn more to the right?
19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
21. 21.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.Which of these suits wheels? (a) moving under water (b) a smooth classroom floor (c) deep mud (d) a muddy building site
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
24. 24.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 34 cm (d) 340 cm
25. 25.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its circumference (d) its diameter
26. 26.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 33. What is under the sensor? (a) the black line (b) the white floor
27. 27.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
28. 28.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
29. 29.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
30. 30.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
31. 31.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns left 90°, then right 45°. What does the gyro read now (0° to 359°)?
32. 32.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
34. 34.True or false: to start on a hand clap, use a touch sensor. (a) True (b) False
35. 35.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
36. 36.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) between the two sensors (d) under the right sensor
38. 38.Which of these suits tracks? (a) flying over a field (b) hovering over a roof (c) a flat road (d) soft snow
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
40. 40.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small

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